21223223112 has 64 divisors (see below), whose sum is σ = 65302231680. Its totient is φ = 5597332992.

The previous prime is 21223223107. The next prime is 21223223137. The reversal of 21223223112 is 21132232212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4856613 + ... + 4860980.

It is an arithmetic number, because the mean of its divisors is an integer number (1020347370).

Almost surely, 2^21223223112 is an apocalyptic number.

It is an amenable number.

21223223112 is an abundant number, since it is smaller than the sum of its proper divisors (44079008568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223223112 is a wasteful number, since it uses less digits than its factorization.

21223223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717622 (or 9717618 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 21223223112 its reverse (21132232212), we get a palindrome (42355455324).

The spelling of 21223223112 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, one hundred twelve".